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NetBSD 6.1.5 - man page for wd (netbsd section 4)

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WD(4)				   BSD Kernel Interfaces Manual 			    WD(4)

NAME
     wd -- WD100x compatible hard disk driver

SYNOPSIS
     wd* at atabus? drive ? flags 0x0000
     wd* at umass?
     options WD_SOFTBADSECT

DESCRIPTION
     The wd driver supports hard disks that emulate the Western Digital WD100x.  This includes
     standard MFM, RLL, ESDI, IDE, EIDE, and SATA drives.

     The flags are used only with controllers that support DMA operations and mode settings (like
     some pciide controllers).	The lowest order nibble (rightmost digit) of the flags defines
     the PIO mode, the next four bits define the DMA mode and the third nibble defines the Ultra-
     DMA mode.	For each set of four bits, the 3 lower bits define the mode to use and the last
     bit must be set to 1 for this setting to be used.	For DMA and UDMA, 0xf (1111) means 'dis-
     able'.  For example, a flags value of 0x0fac (1111 1010 1100) means 'use PIO mode 4, DMA
     mode 2, disable UltraDMA'.  0x0000 means "use whatever the drive claims to support."

     The kernel configuration option ``options WD_SOFTBADSECT'' enables a software managed bad-
     sector list which will prevent further accesses to sectors where an unrecoverable read error
     occurred.	A user interface is provided by dkctl(8).  Unlike the (historical) mechanisms
     provided by bad144(8) and badsect(8) the software list does neither support sector replace-
     ment nor is it saved across reboots.

SEE ALSO
     ata(4), intro(4), pciide(4), scsi(4), umass(4), wdc(4), atactl(8), dkctl(8)

BUGS
     The optional software bad sector list does not interoperate well with sector remapping fea-
     tures of modern disks.  To let the disk remap a sector internally, the software bad sector
     list must be flushed or disabled before.

BSD					 August 30, 2004				      BSD
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